header {
    height: 1.5rem;
    background: darkorange;
    margin-bottom: 0.3rem;
}

.form-group {
    text-align: left;
}

#username_check_tips, #email_check_tips, #password_check_tips {
    margin-bottom: 0.2rem;
    margin-top: 0;
    text-align: left;
}

